Good info, thanks. Problem with "goodwill" is that Tesla has also stated it is a one-time gesture, whether warrantied or not.
I asked if they would change it, the answer was a firm no. While waiting there I was listening to other customers and their problems. I realized that the staff there was completely powerless, so decided there is absolutely no reason to try to fight them, there really isn't much they can do so I have absolutely nothing to gain other than venting. If corporate says "good-will, no option", why bother to give the staff a hard time? If I'm going to fight anyone, it will be the corporate Tesla.
After 1 treatment you have to pay if a 2nd application is needed. For this reason, speed of seriously delayed service, and others I chose the NCDS route.
I was told that repeat treatments are covered while under warranty. The answer to your next question is no, I did not get that in writing. Not sure that it matters with Tesla anyways, I do have emails from service from before stating yellow screen would be covered under warranty. I figure they could claim the employee was uninformed in either case, so why bother.
I trust you made it clear that you were not agreeing on their interpretation that it was not covered under warranty?
I signed nothing saying I agree it's a good will repair. If it breaks, and they fix it again, no problem. If they refuse to fix it or give me some runaround to wait months until the machine comes back to the SvC again, I can take it via the NCDS route then. I was actually just about to go through the NCDS, but decided to email the service center one last time to find out whether the fix is available and they replied it was, so I scheduled a fix. I'm reasonable and practical.
I will tell you something else though. It is my wife's car which has this problem, she dropped it off, I told her I would pick it up because I was thinking about upgrading my P85DL to a Raven P100DL. However, after sitting there waiting to pick up the car, listening to other folks and their frustrations with issues like non-reproducible errors and getting charged for diagnostics (to be fair, service waved them but explained to the customer if he brings it back again and they can't repro what I understood to be A/C failing, they will have to charge him 2 hrs shop time), it cured me. It really made me think - my P85DL is in good shape, little battery degradation, MCU getting slow but the new one has got issues too (my wife's car has MCU2). Getting a new Tesla is just rolling the dice to potentially have more issues to deal with in exchange for a quieter car with some extra power (P85DL is not slow by any means, even though it doesn't produce the originally advertised power). Even if I have to replace the MCU on the old car at some point, it's still better than chancing it with a brand new Tesla. The "evil you know" I guess?